var events = require('events'),

util = require('util');

/*

* Main Button constructor

* Process options

* Tell the board to set it up

*/

var Button = function (options) {

if (!options || !options.board) throw new Error('Must supply required options to Button');

this.board = options.board;

this.pin = options.pin || 13;

this.down = false;

this.board.pinMode(this.pin, 'in');

var self = this;

setInterval(function () {

self.board.digitalRead(self.pin);

}, 50);

this.board.on('data', function (m) {

m = m.slice(0, -1).split('::');

var err = null;

if (m.length > 1 && m[0] == self.pin) {

// 0 is up

// 1 is down

if (m[1] == 0 && self.down) {

self.down = false;

self.emit('up', err);

}

if (m[1] == 1 && !self.down) {

self.down = true;

self.emit('down', err);

}

}

});

}

/*

* EventEmitter, I choose you!

*/

util.inherits(Button, events.EventEmitter);

module.exports = Button;